How to Find the Low-Pressure A/C Port on Your Car

One of the most frequently-asked questions we get at A/C Pro is “How do I find the low-pressure port on my car?” That’s because the low-pressure service port is where you connect to the air conditioning system to recharge it with A/C Pro (or seal leaks with Super Seal).

The exact location of the low-pressure port varies between different car models. But you can easily find it on any vehicle in just a couple of simple steps:

Start at the A/C compressor. It’s attached to the front of the engine, and is powered by a belt and pulley. It can be either at the top or down along the side of the engine, as shown in these two examples:

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One way to tell the compressor apart from other belt-driven parts, such as the alternator, is to turn the engine on but turn the A/C off; the compressor will then be the only pulley that’s not turning. The the A/C compressor can also be identified because it has two metal tubes coming out of it.

The two tubes are different sizes. The smaller tube is the high-pressure line. The larger-diameter tube is the low-pressure line, which is the one you’re looking for. It runs from the compressor back towards the passenger compartment. Follow that line until you find the one and only valve that sticks out of it, which looks like this:

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It should be covered with a plastic cap, which you can unscrew to access the service port.

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Now, here’s the part that makes it foolproof: You can be absolutely certain you’ve found the correct port by simply attaching the coupler on the end of the A/C Pro hose to it.

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If it’s the low-pressure service port, the connector will easily snap on and lock into place. This is the one and only place on the entire car where the A/C Pro connector will both fit and lock on. So, it’s literally impossible to mess up and put A/C Pro refrigerant in the wrong place.

If you’d like help in finding where along the low-pressure service port is located on your particular vehicle, check out our port locator tool, or contact our friendly service representatives either through email or by phone at 888-318-5454.